28873133 has 4 divisors (see below), whose sum is σ = 28897500. Its totient is φ = 28848768.

The previous prime is 28873057. The next prime is 28873139. The reversal of 28873133 is 33137882.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33137882 = 2 ⋅16568941.

It can be written as a sum of positive squares in 2 ways, for example, as 3602404 + 25270729 = 1898^2 + 5027^2 .

It is a cyclic number.

It is not a de Polignac number, because 28873133 - 2¹⁴ = 28856749 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28873093 and 28873102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28873139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10310 + ... + 12807.

It is an arithmetic number, because the mean of its divisors is an integer number (7224375).

Almost surely, 2^28873133 is an apocalyptic number.

It is an amenable number.

28873133 is a deficient number, since it is larger than the sum of its proper divisors (24367).

28873133 is a wasteful number, since it uses less digits than its factorization.

28873133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24366.

The product of its digits is 24192, while the sum is 35.

The square root of 28873133 is about 5373.3725908409. The cubic root of 28873133 is about 306.7830097052.

The spelling of 28873133 in words is "twenty-eight million, eight hundred seventy-three thousand, one hundred thirty-three".